Asians outscore whites, whites outscore Hispanics, Hispanics outscore blacks on DAS-II subtests. White-black gaps correlate strongly with g loadings (r significant). Asian-black gaps correlate strongly with g loadings. Asian-Hispanic gaps correlate strongly with g loadings. White-Hispanic gaps correlate strongly with g loadings. Hispanic-black and Asian-white gaps show weak, non-significant correlations with g loadings. DAS-II shows measurement invariance across whites, blacks, Asians, Hispanics. Same abilities explain within-group and between-group differences. Asian-white gap likely due to non-g factors like visual processing. Blacks slightly superior to Hispanics on simple memory and speed tests. Spearman's hypothesis replicated for multiple racial gaps. g explains Asian and white superiority over blacks and Hispanics. Test unbiased measure of cognitive abilities across races. Higher-order g model fits DAS-II data well.